Electrophoretic display device driving circuit, electrophoretic display device, and electronic apparatus

1. An electrophoretic display device driving circuit that drives an electrophoretic display device that includes a display unit having a plurality of pixels, each of the plurality of pixels including:

an electrophoretic element, containing electrophoretic particles, that is provided between a pixel electrode and a common electrode that face each other;

a pixel switching element;

a memory circuit to which an image signal may be written through the pixel switching element; and

a switch circuit that controls switching of the pixel electrode in accordance with an output based on the image signal in the memory circuit, the electrophoretic display device driving circuit comprising:

a low-speed clock supply unit that supplies a low-speed clock;

a high-speed clock supply unit that supplies a high-speed clock having a frequency higher than that of the low-speed clock; and

a control unit, the control unit controlling writing of the image signal to the memory circuit on the basis of the high-speed clock when changing images, and controlling supply of a predetermined pixel potential to the pixel electrode through the switching control on the basis of the low-speed clock during a stand-by mode when images are not being changed.

2. The electrophoretic display device driving circuit according to claim 1 , further comprising:

a power supply unit that supplies the pixel potential to the display unit and that supplies a common potential to the common electrode in synchronization with the supply of the pixel potential, wherein

the control unit controls supply of the pixel potential and the common potential by the power supply unit on the basis of the low-speed clock.

3. The electrophoretic display device driving circuit according to claim 2 , wherein the power supply unit varies the common potential to any one of a low potential level and a high potential level having a potential higher than the low potential level and then supplies the common potential.

4. The electrophoretic display device driving circuit according to claim 1 , further comprising:

a memory writing execution unit that executes writing of the image signal to the memory circuit, wherein

the control unit controls both the high-speed clock supply unit and the memory writing execution unit.

5. An electrophoretic display device comprising:

a display unit that includes a plurality of pixels, each of the plurality of pixels including:

an electrophoretic element, containing electrophoretic particles, that is provided between a pixel electrode and a common electrode that face each other;

a pixel switching element;

a memory circuit to which an image signal may be written through the pixel switching element; and

a switch circuit that controls switching of the pixel electrode in accordance with an output based on the image signal in the memory circuit;

a low-speed clock supply unit that supplies a low-speed clock;

a high-speed clock supply unit that supplies a high-speed clock having a frequency higher than that of the low-speed clock; and

a control unit, the control unit controlling writing of the image signal to the memory circuit on the basis of the high-speed clock when changing images, and controlling supply of a predetermined pixel potential to the pixel electrode through the switching control on the basis of the low-speed clock during a stand-by mode when images are not being changed.

6. An electronic apparatus comprising the electrophoretic display device according to claim 5 .

7. An electrophoretic display device driving circuit that drives an electrophoretic display device that includes a display unit having a plurality of pixels, each of the plurality of pixels including:

an electrophoretic element, containing electrophoretic particles, that is provided between a pixel electrode and a common electrode that face each other;

a pixel switching element; and

a memory circuit to which an image signal may be written through the pixel switching element and which is able to supply a predetermined pixel potential to the pixel electrode in accordance with the written image signal,

the electrophoretic display device driving circuit comprising:

a low-speed clock supply unit that supplies a low-speed clock;

a high-speed clock supply unit that supplies a high-speed clock having a frequency higher than that of the low-speed clock; and

a control unit, the control unit controlling writing of the image signal to the memory circuit on the basis of the high-speed clock when changing images, and controlling supply of a predetermined pixel potential to the pixel electrode through the switching control on the basis of the low-speed clock during a stand-by mode when images are not being changed.

8. The electrophoretic display device driving circuit according to claim 7 , further comprising:

a power supply unit that supplies the pixel potential to the display unit and that supplies a common potential to the common electrode in synchronization with the supply of the pixel potential, wherein

the control unit controls supply of the pixel potential and the common potential by the power supply unit on the basis of the low-speed clock.

9. The electrophoretic display device driving circuit according to claim 8 , wherein the power supply unit varies the common potential to any one of a low potential level and a high potential level having a potential higher than that of the low potential level and then supplies the common potential.

10. The electrophoretic display device driving circuit according to claim 7 , further comprising:

a memory writing execution unit that executes writing of the image signal to the memory circuit, wherein

the control unit controls both the high-speed clock supply unit and the memory writing execution unit.

11. An electrophoretic display device comprising the electrohoretic display device driving circuit according to claim 7 .